Qt4 - Open: New way and interface for File Open using an integration of QFileDialog inside the FileOpenPanel. The integration should be alright.
Be careful for your eyes when reading the code, it can burn them :)
Anyway, there are still a few bugs (the main one is the disapearing of QFileDialog on acceptance) and some alignment issues.

I got NO idea how this behaves under Windows... A special code may be needed.